You can read in wikipedia that in planets with substantial atmposphere, the exosphere is the uppermost layer of the atmosphere where it merges with the interplanetary space (credit to wikipedia).
Then c. is the right option.
Answer:
cultures are areas that share common features. ... The states or countries within these cultures are also located in the same area. Geographers create these cultures based on the information they want to study. If geographers want to learn about your state, they would divide it into cultures
Is that a stament or question?
